CN106842520B - High-definition panoramic all-around optical imaging system - Google Patents
High-definition panoramic all-around optical imaging system Download PDFInfo
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- CN106842520B CN106842520B CN201710201340.4A CN201710201340A CN106842520B CN 106842520 B CN106842520 B CN 106842520B CN 201710201340 A CN201710201340 A CN 201710201340A CN 106842520 B CN106842520 B CN 106842520B
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G02B13/00—Optical objectives specially designed for the purposes specified below
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Abstract
The invention discloses a high-definition panoramic all-round-view optical imaging system, which is sequentially provided with the following components from an object plane to an image plane: the optical power of the front lens group is negative, and the front lens group comprises a first lens, a second lens and a third lens; the focal power of the first lens and the focal power of the second lens are negative, and the focal power of the third lens is positive; a diaphragm; the focal power of the rear lens group is positive, and the rear lens group comprises a fourth lens, a fifth lens and a sixth lens; the focal power of the fourth lens and the focal power of the sixth lens are positive, and the focal power of the fifth lens is negative; an optical filter; and (4) protecting the glass. The invention realizes the ultra-large wide angle with the maximum field angle of 230 degrees, the large relative aperture and the high-definition lens with megapixels, can be used for the aspects of three-dimensional reconstruction, panoramic browsing video monitoring, spherical screen projection and the like, has higher definition in the temperature range of-40 ℃ to +85 ℃, and is particularly suitable for the vehicle-mounted environment with severe environment.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to an optical system, in particular to a high-definition panoramic all-round looking optical imaging system.
[ background of the invention ]
At present, three-dimensional reconstruction and panoramic browsing video monitoring are well developed, a whole set of imaging system of the system is often imaged by a plurality of lenses and then is realized only by image synthesis and splicing, and the negative influence caused by the fact that the cost of the lenses is increased is brought; harsh environments such as high and low temperatures also affect the performance and stability of the imaging system.
Therefore, the present invention has been made in view of the above disadvantages.
[ summary of the invention ]
The invention aims to solve the technical problem of providing a high-definition panoramic all-round optical imaging system which is low in cost, high in definition, large in field angle and strong in light transmission capacity and can meet imaging requirements in the fields of three-dimensional reconstruction, panoramic browsing, video monitoring and vehicle-mounted lenses.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a high definition panorama looking around optical imaging system which characterized in that is equipped with from the object plane to image plane in proper order:
the optical power of the front lens group is negative, and the front lens group comprises a first lens, a second lens and a third lens; the focal power of the first lens and the focal power of the second lens are negative, and the focal power of the third lens is positive;
a diaphragm;
the rear lens group is positive in focal power and comprises a fourth lens, a fifth lens and a sixth lens; focal power of the fourth lens and the sixth lens is positive, and focal power of the fifth lens is negative;
an optical filter;
and (4) protecting the glass.
The high-definition panoramic all-round looking optical imaging system is characterized in that: the first lens is a meniscus lens with a convex surface facing the object plane and a concave surface facing the image plane; the second lens is a meniscus lens with a convex surface facing the object plane and a concave surface facing the image plane; both faces of the third lens are convex.
The high-definition panoramic all-round looking optical imaging system is characterized in that: the two surfaces of the fourth lens are convex surfaces, the fifth lens is a meniscus lens with a concave surface facing the object plane and a convex surface facing the image plane, and the two surfaces of the sixth lens are convex surfaces.
The high-definition panoramic all-round looking optical imaging system is characterized in that: the front lens group and the rear lens group meet the following requirements:
-11.2≤F before ≤-5.5；-13.6≤F before /F≤-6.1；
2.41≤F after ≤2.72；2.68≤F after /F≤3.49；
1.85≤|F before /F after |≤4.7；
wherein, F before Is the focal length of the front lens group, F after F is the focal length of the rear lens group and F is the total focal length of the optical system.
The high-definition panoramic all-around optical imaging system is characterized in that: the refractive index and the Abbe number of the first lens, the third lens and the fifth lens meet the following requirements:
1.7≤Nd 1 ≤1.9；45≤Vd 1 ≤65；
Nd 3 ≥1.8；Vd 3 ≤23；
Nd 5 ≥1.55；Vd 5 ≤25；
wherein, nd 1 、Nd 3 、Nd 5 Refractive indexes of the first lens, the third lens and the fifth lens respectively; vd 1 、Vd 3 、Vd 5 Abbe numbers of the first lens, the third lens and the fifth lens are respectively.
The high-definition panoramic all-round looking optical imaging system is characterized by meeting the following requirements:
1.8≤ET 2 /T 2 ≤4；
2.68≤Φ 1 /MIC≤3.3；
2.3≤A 6 /F≤3.0；
wherein, ET 2 、T 2 Edge thickness and center thickness, phi, of the second lens, respectively 1 The aperture size of the first lens, MIC represents the maximum image plane, A 6 Is the minimum distance from the sixth lens to the image plane.
The high-definition panoramic all-round looking optical imaging system is characterized in that: the total field angle and the total lens length of the optical lens respectively meet the following requirements:
170°≤2W≤230°；14≤TTL/F≤17.2；
in the formula, 2W is the field angle of the lens, and TTL is the distance from the vertex of the first lens to the image plane.
The high-definition panoramic all-round looking optical imaging system is characterized in that: the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspheric lenses, the fourth lens and the fifth lens are glued by plastic lenses, and the gluing surfaces of the fourth lens and the fifth lens are spherical surfaces or aspheric surfaces.
The high-definition panoramic all-round looking optical imaging system is characterized in that: the first lens and the third lens are spherical glass lenses; the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspheric lenses and satisfy the aspheric lens formula:
in the formula, a parameter c is the curvature corresponding to the radius, y is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, and k is a conical conic coefficient; when the k coefficient is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when the k coefficient is equal to-1, the surface-shaped curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface-shaped curve of the lens is an ellipse, when the k coefficient is equal to 0, the surface-shaped curve of the lens is a circle, and when the k coefficient is more than 0, the surface-shaped curve of the lens is an oblate; alpha is alpha 1 To alpha 8 Each representing a coefficient corresponding to each radial coordinate.
Compared with the prior art, the high-definition panoramic all-round looking optical imaging system disclosed by the invention has the following effects:
1. the invention realizes an ultra-large wide angle with a maximum field angle of 230 degrees, a large relative aperture and a high-definition lens with megapixels, can be used for three-dimensional reconstruction, panoramic browsing video monitoring, spherical screen projection and the like, has higher definition within the temperature range of-40 ℃ to +85 ℃, and is particularly suitable for vehicle-mounted environments with severe environments.
2. The invention reasonably distributes the refractive index and the Abbe number, effectively corrects the overlarge axial chromatic aberration of the system, can ensure that the first lens has smaller caliber, and is more beneficial to the miniaturization of the lens.
3. The protective glass provided with the optical filter and the image sensor can filter part of light to reduce veiling glare, facula and the like, so that the image is bright and sharp in color and has good color reducibility.
4. The invention introduces the plastic aspheric lens, can effectively reduce the volume of the lens and can realize higher resolution.
[ description of the drawings ]
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a graph of MTF VS field at 125lp/mm in accordance with the present invention;
FIG. 3 is a graph of color difference of the present invention;
FIG. 4 is a high temperature +20 ℃ through focus MTF plot of the present invention;
FIG. 5 is a plot of the high temperature +85 ℃ off-focus MTF of the present invention;
FIG. 6 is a plot of the low temperature-40 ℃ off-focus MTF of the present invention;
description of the drawings: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a sixth lens; 7. an optical filter; 8. protecting glass; 9. a diaphragm; 10. and (4) an image plane.
[ detailed description ] A
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 6, a high-definition panoramic all-around optical imaging system sequentially comprises, from an object plane to an image plane 10:
a front lens group 100, wherein the focal power of the front lens group 100 is negative, and the front lens group 100 comprises a first lens 1, a second lens 2 and a third lens 3; the focal power of the first lens 1 and the second lens 2 is negative, and the focal power of the third lens 3 is positive;
a diaphragm 9;
the rear lens group 200, the focal power of the rear lens group 200 is positive, the rear lens group 200 includes a fourth lens 4, a fifth lens 5, and a sixth lens 6; the focal power of the fourth lens 4 and the sixth lens 6 is positive, and the focal power of the fifth lens 5 is negative;
an optical filter 7;
a cover glass 8; the optical filter and the protective glass can filter part of light to reduce veiling glare, facula and the like, so that the image is bright and sharp in color and has good color reducibility.
The invention realizes the ultra-large wide angle with the maximum field angle of 220 degrees, the large relative aperture and the high-definition lens with megapixels, can be used for the aspects of three-dimensional reconstruction, panoramic browsing video monitoring, spherical screen projection and the like, has higher definition in the temperature range of-40 ℃ to +85 ℃, and is particularly suitable for the vehicle-mounted environment with severe environment.
As shown in fig. 1 to 6, in the present embodiment, the first lens 1 is a meniscus lens in which a surface facing an object plane is a convex surface and a surface facing an image plane 10 is a concave surface; the second lens 2 is a meniscus lens with a convex surface facing the object plane and a concave surface facing the image plane 10; both faces of the third lens 3 are convex.
As shown in fig. 1 to 6, in the present embodiment, both surfaces of the fourth lens element 4 are convex surfaces, the fifth lens element 5 is a meniscus lens element whose surface facing the object plane is concave and whose surface facing the image plane 10 is convex, and both surfaces of the sixth lens element 6 are convex surfaces; the imaging area of the edge of the side, facing the image plane 10, of the sixth lens generates reverse curvature, and the reverse curvature is mainly characterized by improving the MTF performance and the relative illumination of the peripheral field.
As shown in fig. 1 to 6, in the present embodiment, the front lens group 100 and the rear lens group 200 satisfy:
-11.2≤F before ≤-5.5；-13.6≤F before /F≤-6.1；
2.41≤F after ≤2.72；2.68≤F after /F≤3.49；
1.85≤|F before /F after |≤4.7；
wherein, F before Is the focal length of the front lens group 100, F after Is the focal length of the rear lens group 200, and F is the total focal length of the optical system; the wide field angle can be effectively converged into the optical system, and the tolerance sensitivity of the optical system is reduced.
As shown in fig. 1 to 6, in the present embodiment, the refractive indices and abbe numbers of the first lens 1, the third lens 3, and the fifth lens 5 satisfy:
1.7≤Nd 1 ≤1.9；45≤Vd 1 ≤65；
Nd 3 ≥1.8；Vd 3 ≤23；
Nd 5 ≥1.55；Vd 5 ≤25；
wherein, nd 1 、Nd 3 、Nd 5 Refractive indexes of the first lens 1, the third lens 3 and the fifth lens 5 respectively; vd 1 、Vd 3 、Vd 5 Abbe numbers of the first lens 1, the third lens 3 and the fifth lens 5 respectively; the distribution of the refractive index and the Abbe number effectively corrects the overlarge axial chromatic aberration of the system, and can ensure that the first lens has a smaller caliber, which is more beneficial to the miniaturization of the lens.
As shown in fig. 1 to 6, in the present embodiment, the following are satisfied:
1.8≤ET 2 /T 2 ≤4；
2.68≤Φ 1 /MIC≤3.3；
2.3≤A 6 /F≤3.0；
wherein, ET 2 、T 2 Edge thickness and center thickness, phi, of the second lens 2, respectively 1 The aperture size of the first lens element 1, MIC represents the maximum image plane, A 6 The minimum distance from the sixth lens 6 to the image plane 10; the total length of the lens is effectively shortened, so that the optical system has a larger aperture.
As shown in fig. 1 to 6, in the present embodiment, the total field angle and the total lens length of the optical lens respectively satisfy:
170°≤2W≤230°；14≤TTL/F≤17.2；
where 2W is the angle of view of the lens, and TTL is the distance from the vertex of the first lens element 1 to the image plane 10.
As shown in fig. 1 to 6, in the present embodiment, the second lens element 2, the fourth lens element 4, the fifth lens element 5, and the sixth lens element 6 are plastic aspheric lens elements, the fourth lens element 4 and the fifth lens element 5 are cemented by plastic lenses, and the cemented surfaces of the fourth lens element 4 and the fifth lens element 5 may be spherical or aspheric.
As shown in fig. 1 to 6, in the present embodiment, the first lens 1 and the third lens 3 are spherical glass lenses; the second lens element 2, the fourth lens element 4, the fifth lens element 5 and the sixth lens element 6 are plastic aspheric lens elements, and satisfy the aspheric lens formula:
in the formula, a parameter c is the curvature corresponding to the radius, y is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, and k is a conical conic coefficient; when the k coefficient is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when the k coefficient is equal to-1, the surface-shaped curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface-shaped curve of the lens is an ellipse, when the k coefficient is equal to 0, the surface-shaped curve of the lens is a circle, and when the k coefficient is more than 0, the surface-shaped curve of the lens is an oblate; alpha is alpha 1 To alpha 8 Each representing a coefficient corresponding to each radial coordinate. The introduction of the plastic aspheric lens can effectively reduce the volume of the lens and realize higher resolution.
In the optical system, the main optical parameters are as follows:
F＝0.88mm，A 6 ＝2.3mm，TTL＝12.6mm，2W＝220°，FNO＝2.0
wherein FNO represents the reciprocal of the relative aperture.
The optical parameters of the lens of the high-definition panoramic all-round optical imaging system are as follows:
| Surface | Type | R | | Nd | Vd | |
| 1 | STANDARD | 11.00 | 0.85 | 1.804 | 46.5 | |
| 2 | STANDARD | 3.17 | 2.10 | |||
| 3 | EVENASPH | 8.02 | 0.70 | 1.535 | 56.115 | |
| 4 | EVENASPH | 0.98 | 1.52 | |||
| 5 | STANDARD | 7.39 | 1.84 | 1.946 | 17.9 | |
| 6 | STANDARD | -7.39 | 0.68 | |||
| 7 | STANDARD | INFINITY | -0.01 | |||
| 8 | EVENASPH | 2.99 | 1.28 | 1.535 | 56.115 | |
| 9 | EVENASPH | -1.09 | 0.41 | 1.6425 | 22.465 | |
| 10 | EVENASPH | -12.94 | 0.21 | |||
| 11 | EVENASPH | 5.19 | 0.84 | 1.535 | 56.115 | |
| 12 | EVENASPH | -2.33 | 0.20 | |||
| 13 | STANDARD | INFINITY | 0.70 | |||
| 14 | STANDARD | INFINITY | 1.37 | |||
| 15 | STANDARD | INFINITY | 0.00 |
in the above table, R represents a curvature radius, thickness represents a center Thickness, nd represents a refractive index, vd represents an abbe number, STANDARD represents a spherical lens, and EVENASPH represents an even-order aspherical surface, which satisfy the aspherical lens formula.
The aspherical coefficients are as follows:
the parameters of the optical imaging system are contained in the condition formula of the invention content, and the invention finally provides a high-definition panoramic all-round looking imaging system which has the advantages of high definition, large field angle, large relative aperture, small chromatic aberration and the like.
Claims (4)
1. The utility model provides a high definition panorama looks around optical imaging system which characterized in that is equipped with from the object plane to image plane (10) in proper order:
the zoom lens comprises a front lens group (100), wherein the focal power of the front lens group (100) is negative, and the front lens group (100) comprises a first lens (1), a second lens (2) and a third lens (3); the focal power of the first lens (1) and the second lens (2) is negative, and the focal power of the third lens (3) is positive;
a diaphragm (9);
the zoom lens comprises a rear lens group (200), wherein the focal power of the rear lens group (200) is positive, and the rear lens group (200) comprises a fourth lens (4), a fifth lens (5) and a sixth lens (6); the focal power of the fourth lens (4) and the sixth lens (6) is positive, and the focal power of the fifth lens (5) is negative;
a filter (7);
a cover glass (8);
the front lens group (100) and the rear lens group (200) meet the following requirements:
-11.2≤F before ≤-5.5；-13.6≤F before /F≤-6.1；
2.41≤F after ≤2.72；2.68≤F after /F≤3.49；
1.85≤|F before /F after |≤4.7；
wherein, F before Is the focal length of the front lens group (100), F after Is the focal length of the rear lens group (200), and F is the total focal length of the optical system;
the refractive index and the Abbe number of the first lens (1), the third lens (3) and the fifth lens (5) satisfy that:
1.7≤Nd 1 ≤1.9；45≤Vd 1 ≤65；
Nd 3 ≥1.8；Vd 3 ≤23；
Nd 5 ≥1.55；Vd 5 ≤25；
wherein, nd 1 、Nd 3 、Nd 5 Refractive indexes of the first lens (1), the third lens (3) and the fifth lens (5) respectively; vd 1 、Vd 3 、Vd 5 Abbe numbers of the first lens (1), the third lens (3) and the fifth lens (5) respectively;
1.8≤ET 2 /T 2 ≤4；
2.68≤Φ 1 /MIC≤3.3；
2.3≤A 6 /F≤3.0；
wherein, ET 2 、T 2 The edge thickness and the center thickness, phi, of the second lens (2), respectively 1 Is the aperture size of the first lens (1), MIC represents the maximum image plane, A 6 Is the sixth lens (6) to the imageA minimum distance of the faces (10);
the total field angle and the total lens length of the optical lens respectively meet the following requirements:
170°≤2W≤230°；14≤TTL/F≤17.2；
wherein 2W is the field angle of the lens, and TTL is the distance from the top point of the first lens (1) to the image plane (10);
the first lens (1) is a meniscus lens of which the surface facing an object plane is a convex surface and the surface facing an image plane (10) is a concave surface; the second lens (2) is a meniscus lens with a convex surface facing the object plane and a concave surface facing the image plane (10); both faces of the third lens (3) are convex.
2. The high-definition panoramic all-round looking-around optical imaging system of claim 1, characterized in that: the two surfaces of the fourth lens (4) are convex surfaces, the fifth lens (5) is a meniscus lens with a concave surface facing the object plane and a convex surface facing the image plane (10), and the two surfaces of the sixth lens (6) are convex surfaces.
3. The high-definition panoramic all-round looking-around optical imaging system of claim 1, characterized in that: the second lens (2), the fourth lens (4), the fifth lens (5) and the sixth lens (6) are plastic aspheric lenses, the fourth lens (4) and the fifth lens (5) are glued by plastic lenses, and the gluing surfaces of the fourth lens (4) and the fifth lens (5) are spherical surfaces or aspheric surfaces.
4. The high definition panoramic looking-around optical imaging system of claim 3, wherein: the first lens (1) and the third lens (3) are spherical glass lenses; the second lens (2), the fourth lens (4), the fifth lens (5) and the sixth lens (6) are plastic aspheric lenses and satisfy the formula of the aspheric lens:
in the formula, the parameter c isThe curvature corresponding to the radius, y is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, and k is a conical conic section coefficient; when the k coefficient is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when the k coefficient is equal to-1, the surface-shaped curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface-shaped curve of the lens is an ellipse, when the k coefficient is equal to 0, the surface-shaped curve of the lens is a circle, and when the k coefficient is more than 0, the surface-shaped curve of the lens is an oblate; alpha is alpha 1 To alpha 8 Each representing a coefficient corresponding to each radial coordinate.
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| CN107422462A (en) * | 2017-09-25 | 2017-12-01 | 河南翊轩光电科技有限公司 | A kind of large aperture ultra high-definition day and night confocal optical system |
| CN108107550A (en) * | 2017-11-07 | 2018-06-01 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN107621689B (en) * | 2017-11-08 | 2023-04-28 | 广东弘景光电科技股份有限公司 | Miniaturized fish-eye optical system |
| CN108490583B (en) * | 2018-03-30 | 2024-05-24 | 中山联合光电科技股份有限公司 | High-pixel wide-angle lens |
| CN111340695A (en) * | 2020-02-10 | 2020-06-26 | 上海智幻软件科技有限公司 | Super-resolution reconstruction method of dome screen video |
| CN111352222B (en) * | 2020-05-25 | 2020-08-11 | 宁波永新光学股份有限公司 | Small high-definition vehicle-mounted wide-angle imaging system |
| WO2022120813A1 (en) * | 2020-12-11 | 2022-06-16 | 欧菲光集团股份有限公司 | Optical system, image capturing module and electronic apparatus |
| CN114047613B (en) * | 2021-10-29 | 2023-07-18 | 歌尔光学科技有限公司 | Optical system and projection device |
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